© Caleffi 11236_iSolar_Plus.mon
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VBus
S1
S2
S4 / TR
System layout 1
The controller calculates the temperature difference
between collector sensor S1 and store sensor S2. If the
difference is larger than or identical to the adjusted switch-
on temperature difference (DT O), the solar pump will be
operated by relay 1, and the store will be loaded until the
switch-off temperature difference (DT F) or the maximum
store temperature (S MX) is reached.
Sensors S3 and S4 can optionally be connected for mea-
R1
Arr 1
S3
1.4 Terminal allocation in the different system layouts
Display Channels
Channel
Description
Terminal
Page
INIT
x*
ODB initialization active
-
37
FLL
x*
ODB filling time active
-
37
STAB
x*
ODB stabilization in progress
-
37
COL
x
Temperature collector
S1
37
TST
x
Temperature tank
S2
37
S3
x
Temperature sensor 3
S3
37
TSTT
x*
Temperatur tank at the top
S3
37
S4
x
Temperature sensor 4
S4
37
TR
x*
Temperature return sensor
S4
37
n %
x
Pump speed R1
R1
38
hP
x
Operating hours R1
R1
38
hP1
x*
Operating hours R1 (if OBST is activated)
R1
38
hP2
x*
Operating hours R2 (if OBST is activated)
R2
38
kWh
x*
Heat quantity kWh
-
38
MWh
x*
Heat quantity MWh
-
38
TIME
x
Time
-
34
surement purposes. S3 can optionally be used as reference
sensor for the store emergency shutdown option (OSEM).
If heat quantity measurement (OHQM) is activated, sensor
S4 has to be connected as return sensor.
If the drainback option (ODB) is activated, relay 2 can be
used to operate a booster pump by activating the booster
function (OBST).
S1
S3
S2
S4/TR
R1
R2
exemplary
Drainback system layout
(with booster pump)